diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index ca9e6a0..e69de29 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,5 +0,0 @@
-{
-    "recommendations": [
-        "hediet.vscode-drawio"
-    ]
-}
\ No newline at end of file
diff --git a/README.md b/README.md
index bd68f9c..eef51be 100644
--- a/README.md
+++ b/README.md
@@ -353,6 +353,13 @@ Step 2: 显示图表
 
 ![](pictures/make_chart.drawio.svg)
 
+#### query_data
+
+Step 1: 输入学生学号
+Step 2: if学号不存在 then 提示学生不存在并结束 
+Step 3: else 学号存在 then 输出学号、姓名、成绩 
+
+![](pictures/query_data.drawio.svg)
 
 #### confirm